HELP PLEASE!! A submarine is 200 feet below sea level. A helicopter is at 3200 feet above sea level. How far apart are the submarine and helicopter?

A park is 80 feet long by 20 feet wide. The length and width of the park will each be increased by the same number of feet. This expression represents the perimeter of the larger park.

(x+80) + (x + 20) + (x + 80) + (x + 20)
Which expressions are equivalent to the perimeter of the larger park? Select all that apply.

A rectangular pool has a perimeter of 72 feet. The equation below shows
the relationship between the length, L, and the width, W, of the pool.

2L + 2W = 72

The width, W, of the pool is 12 feet. What is the length, L, of the pool?